Frederick w



March 13, 1928.

F. W. BOLD ,FUSE

Original Filed Jan.2, 1.925

1310627501 M 6- 1 61, z a

a t torfley Patented Mar. 13, 19 28.

UNITED v STATES PATEN FREDERICK W. BOLD, OF'CHELSEA, MASSACHUSETTS, ASSIGNOR TO CHARLES H.

' PEARSON, F BROOKLINE, MASSACHUSETTS.

FUSE.

7 Original application'filed January 2, 1925, Serial No. 285. Divided and this application filed December 4,

My present invention relates to mechanical time fuses, and more particularly to an improved means for operatively connecting the timing train with the setting disc.

In the patent granted to me No. 1,569,911

and dated January 19, 1926, for an improvementi in release leversfor mechanical time fuses, I have disclosed the connecting means for operatively connecting the timing train and the setting disc forming the subject matter of the present invention, and my present application is, therefore, to be considered as a divisional of said prior patent. In order to set the timing train of a mechanical time fuse with the setting disc to detonate at a predetermined time after the shell to which the same is attached is put in flight it is necessary to have such an opera tive connection between the driving train and the timing mechanism that will allow relative movement therebetween during the setting operation and up to the instant that the shell to which the same is attached is put in flight. Further, it is important and desirable that means be provided for preventing longitudinal or axial movement of the connecting means with respect to each other while yet permitting relative movement thereof, the means for preventing axial movement acting as a means for preventing a progressive drifting of the parts due to relatively slight shocks being given to the apparatus. In carrying out my invention I arrange between the staff of the timing train and the sleeve associated with the driving spring of the timing train a circumferential groove into which loosely fits a projecting point or a plurality 'of points on the sleeve of the driving spring. This construction permits relative rotative movement of the staff and sleeve and prevents longitudinal movement of the staff and sleeve and at tached parts with respect to each other and thereby prevents locking together of the sleeve and staff by any shock less than the shock of firing.

The object of my invention, therefore, is an improved means for operatively connecting the timing train and the setting disc of a mechanical time fuse.

In the accompanying drawings illustrating the preferred embodiment of my invention,

Fig. 1 is a detail central sectional elevation Serial No. 73,276.

through a portion of a mechanical time fuse;

Fig. 2 is an enlarged sectional elevation of a portion of Fig. 1, and i Fig. 3 is a sectional elevation on the line 3-3 of Fig. 2.

Referring to the drawings, there is illustrated a timing train consisting of various mechanisms mounted on a bottom plate 10, middle plate 11, and top plate 12, these plates being spaced apart from each other in the usual manner. in the middle plate 11 and top plate 12 is a central staff 13, which is provided intermediate its ends with a circumferential groove 14. The lower end of the staff 13 wedge-shaped, as clearly shown in Fig. 1, and rotatably mounted on such central staff is a sleeve 15. While the sleeve 15 is rotatably mounted on the staff 13, it is prevented from longitudinal movement thereon under ordinary conditions by the projections 16 extending into the circumferential groove 14 and formed in such sleeve by prick punching or in any other suitable manner. These projections 16 are sufficient to prevent longitudinal movement of the sleeve 15 on the staff 13 under ordinary conditions but, on the shock of firing, the sleeve 15 will drift and wedge onto the wedge-shaped portion at the lower end of the staff 13 thereby rigidly locking the sleeve 15 and the center stai'f 13 together. Secured to the upper end of the staff 13 is a settingplate 17 and by means of which the relative position of the staff 13 and gear 18, that is secured to the lower end of the sleeve 15, is varied. The sleeve 15 is slidably mounted in a sleeve 19 to which the inner end of the driving spring 20 is secured. Longitudinal movement of the sleeve 15 with respect to the staff 13 may take place without disturbing the posi tion of the driving spring 20 with relation to the other parts of the device.

By my device it will be obvious that independent l'otative movement of the sleeve 15 and staff 18 may take. place and that, by virtue of the circumferential groove 1st and inwardly extending projection 16, longitudinal movement of the sleeve 15 and staff 13 is prevented. As it will be impossible to lock the sleeve 15 and staff 13 together until relative downward movement of the sleeve 15 takes place with respect to the staff 13, and as such relative movement can only Rotatably mounted takeplace on the shock of firing, the-re is no danger ot-such elements being looked to:

gether by any other means. This device, therefore, constitutes a distinct safety feature for mechanical time. fuses.

Having thus described my invention, what transmitting power to the timing train, a-

sleeve associated with the driving motor, a staff associated with the tun-mg tram, a C11- cumferential groove formed in said staff,

and means formed integral with said sleeve and projecting inwardly therefrom into the circumferential groove whereby 'rotative' movement of the sleeve on the. stafi is permitted and lon itudinal movement of said sleeve is prevented under normal conditions v of; operation.

3. The combination with atimin'g train,

of a sleeve associated therewith axially with respect thereto, a stafi' on which said sleeve is mounted, a circumferential groove for-med on'thestafi', a member for-med on the interior ofthe sleeve and projecting into said groove whereby rotary movement of the sleeve and stafi' is permitted normal conditions of service.

In testimony whereof, I have si ed'my name to this specification.

FREDERICK Bonn r and longitudinal movement prevented under 

